/* Watch, Infer, Coordinate project page.
   Role colours come from the paper's Figure 1: violet for Watch (demonstrator),
   green for Coordinate (helper). */

:root {
  --bg: #ffffff;
  --band: #f1f5f7;
  --ink: #15202b;
  --ink-2: #3f4b57;
  --ink-3: #6c7884;
  --rule: #dfe5e9;
  --rule-strong: #c3ccd3;
  --watch: #5d17eb;
  --coord: #09704e;
  --coord-soft: #e7f2ec;
  --panel: #ffffff;
  --code-bg: #f4f7f8;

  --sans: "Schibsted Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --page: 1080px;
  --wide: 1320px;
  --measure: 720px;
  --gutter: 32px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1316;
    --band: #151d21;
    --ink: #e6ecef;
    --ink-2: #b3bfc7;
    --ink-3: #85939e;
    --rule: #243038;
    --rule-strong: #35444e;
    --watch: #a98dff;
    --coord: #4fc89e;
    --coord-soft: #13271f;
    --code-bg: #141b1f;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e1316;
  --band: #151d21;
  --ink: #e6ecef;
  --ink-2: #b3bfc7;
  --ink-3: #85939e;
  --rule: #243038;
  --rule-strong: #35444e;
  --watch: #a98dff;
  --coord: #4fc89e;
  --coord-soft: #13271f;
  --code-bg: #141b1f;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.65;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--coord-soft); }

a { color: var(--coord); text-underline-offset: 3px; }

img, video { max-width: 100%; }

.wrap,
.wide {
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}
.wrap { max-width: var(--page); }
.wide { max-width: var(--wide); }

a:focus-visible, button:focus-visible, video:focus-visible {
  outline: 2px solid var(--coord);
  outline-offset: 3px;
}

/* ---------- Masthead ---------- */

.masthead {
  padding-top: clamp(48px, 9vw, 104px);
  padding-bottom: 40px;
}

.title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(2.45rem, 7.2vw, 4.7rem);
  line-height: 1;
  letter-spacing: -0.032em;
}
.title .t-watch { color: var(--watch); }
.title .t-coord { color: var(--coord); }

.subtitle {
  margin: 0.45em 0 1.5em;
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(1.2rem, 2.7vw, 1.72rem);
  line-height: 1.25;
  letter-spacing: -0.012em;
  text-wrap: balance;
}

.authors {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2em 1.15em;
  margin: 0 0 0.5em;
  padding: 0;
  list-style: none;
  font-family: var(--sans);
  font-size: 1.06rem;
  font-weight: 500;
  line-height: 1.5;
}
.authors a { color: inherit; text-decoration: none; }
.authors a:hover { color: var(--coord); text-decoration: underline; }
.authors sup, .affiliations sup, .footnote sup {
  font-size: 0.68em;
  font-weight: 500;
  color: var(--ink-3);
  margin-left: 1px;
}
.dg { font-family: var(--serif); font-size: 1.2em; font-weight: 600; margin-left: 1px; }

.affiliations {
  margin: 0 0 0.25em;
  font-family: var(--sans);
  font-size: 0.98rem;
  color: var(--ink-2);
}
.affiliations span { margin-right: 1.2em; white-space: nowrap; }

.footnote {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.84rem;
  color: var(--ink-3);
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--ink);
  border-radius: 7px;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn svg { width: 15px; height: 15px; flex: none; }
.btn small { font-size: 0.78em; font-weight: 500; }
a.btn:hover { background: var(--coord); border-color: var(--coord); color: #fff; }

.btn-quiet {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule-strong);
}
a.btn-quiet:hover { background: var(--band); border-color: var(--ink); color: var(--ink); }

.btn.is-pending {
  background: transparent;
  color: var(--ink-3);
  border: 1px dashed var(--rule-strong);
  cursor: default;
}

.lede {
  max-width: 720px;
  margin: 32px 0 0;
  font-size: 1.28rem;
  line-height: 1.5;
  color: var(--ink-2);
}

/* ---------- Videos ---------- */

.teaser video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: #ffffff;
}

.settings {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 24px;
}
.setting { margin: 0; }
.setting video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  background: var(--band);
}
.setting figcaption {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 12px;
  font-family: var(--sans);
}
.setting-name { font-size: 1.05rem; font-weight: 700; color: var(--ink); }
.setting-limit { font-size: 0.92rem; line-height: 1.45; color: var(--ink-2); }
.setting-count { font-size: 0.86rem; font-weight: 600; color: var(--coord); }

.caption,
.pair figcaption,
.note {
  font-family: var(--sans);
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--ink-2);
}
.caption { margin: 14px 0 0; }

.tagline {
  margin-top: 88px;
  margin-bottom: 0;
  font-family: var(--sans);
  font-size: clamp(1.7rem, 4.2vw, 2.7rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--ink);
  text-wrap: balance;
}
.tagline + .block { padding-top: 48px; }

/* ---------- Sections ---------- */

.block { padding-top: 72px; }

.block > h2 {
  margin: 0 0 22px;
  padding-top: 22px;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.022em;
}

.prose { max-width: var(--measure); }
.prose p { margin: 0 0 1em; }
.prose h3,
.step-text h3 {
  margin: 0 0 0.4em;
  font-family: var(--sans);
  font-size: 1.14rem;
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.prose h3 { margin-top: 1.6em; }

/* Watch / Infer / Coordinate rows */
.step {
  display: grid;
  grid-template-columns: minmax(0, 520px) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
  margin-top: 32px;
}
.step:first-of-type { margin-top: 8px; }
.step video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  border-radius: 12px;
  background: var(--band);
}
.step-text { max-width: 460px; }
.step-text h3 { font-size: 1.6rem; font-weight: 750; letter-spacing: -0.02em; }
.step-text p { margin: 0; font-size: 1.04rem; line-height: 1.6; color: var(--ink-2); }
.step-text .note { margin-top: 10px; }
.t-watch { color: var(--watch); }
.t-coord { color: var(--coord); }
.insight { margin-top: 40px; }

.block > .prose + .table-scroll,
.block > .prose + .tables { margin-top: 20px; }

/* ---------- Tables ---------- */

.tables {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
  align-items: start;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table.data {
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.9rem;
  line-height: 1.4;
  color: var(--ink);
}
table.data caption {
  caption-side: top;
  padding: 0 0 10px;
  text-align: left;
  font-size: 1rem;
  font-weight: 650;
  color: var(--ink);
}
table.data th,
table.data td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
}
table.data thead th {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-2);
  border-bottom-color: var(--rule-strong);
}
table.data .num,
table.data td { text-align: right; white-space: nowrap; }
table.data tbody th { font-weight: 500; white-space: nowrap; }
table.data td i {
  margin-left: 0.3em;
  font-style: normal;
  font-size: 0.82em;
  color: var(--ink-3);
}
table.data .best { font-weight: 700; }
table.data .best i { font-weight: 400; }
table.data tr.ours-row th,
table.data tr.ours-row td { background: var(--coord-soft); }
table.data tr.ours-row th { font-weight: 700; }
table.data tr.oracle th,
table.data tr.oracle td { color: var(--ink-3); }

.note { margin: 14px 0 0; color: var(--ink-3); }
.table-scroll .note { font-size: 0.86rem; margin-top: 10px; }

/* ---------- Figure pair ---------- */

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 920px;
  margin: 16px 0 0;
}
.pair figure { margin: 0; }
.pair img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}
.pair figcaption { margin-top: 10px; }
.shot { position: relative; }
.tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 6px 12px;
  border-radius: 8px;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.2;
  color: #ffffff;
}
.tag-off { background: rgba(21, 32, 43, 0.86); }
.tag-on { background: #09704e; }

/* ---------- Citation ---------- */

.bibtex {
  position: relative;
  max-width: 860px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--code-bg);
}
.bibtex pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--ink);
}
.bibtex pre:empty { min-height: 5.5em; }
.copy {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 5px 11px;
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}
.copy:hover { border-color: var(--ink); }

/* ---------- Page end ---------- */

main { padding-bottom: 96px; }

/* ---------- Dark mode: keep paper figures on white ---------- */



/* ---------- Narrow screens ---------- */

@media (max-width: 900px) {
  .tables { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 760px) {
  .settings { grid-template-columns: 1fr; gap: 28px; }
  .step { grid-template-columns: 1fr; gap: 16px; }
}

@media (max-width: 640px) {
  :root { --gutter: 16px; }
  body { font-size: 17px; }
  .lede { font-size: 1.15rem; }
  .block { padding-top: 56px; }
  .tagline { margin-top: 64px; }
  .tagline + .block { padding-top: 36px; }
  .block > h2 { font-size: 1.5rem; }
  .pair { grid-template-columns: 1fr; }
  .authors { font-size: 1rem; gap: 0.15em 0.9em; }
  .btn { padding: 8px 13px; font-size: 0.9rem; }
}